Fig. 2: Fluorescence properties of UCPs and polymerization reaction around UCPs. | Nature Communications

Fig. 2: Fluorescence properties of UCPs and polymerization reaction around UCPs.

From: Upconversion particle-assisted NIR polymerization enables microdomain gradient photopolymerization at inter-particulate length scale

Fig. 2: Fluorescence properties of UCPs and polymerization reaction around UCPs.

a Absorption spectrum of the photoinitiator BAPO in acetonitrile and the emission spectrum of the UCPs under gradient laser intensity excitation, the inset is an SEM image of the UCPs used in this experiment. b Integral of UCPs emission bands between 330–375 nm vs. the excitation intensity at 980 nm. c Morphology of polymer microspheres around individual UCPs cured at different irradiation times (0.1 wt% UCPs, 25 W/cm2 NIR intensity). d Morphology of linked polymer microspheres cured at higher UCPs concentrations (0.5 wt% UCPs, 25 W/cm2 laser intensity).

Back to article page